One World Observatory excellent, Hop-On Hop-Off Tour awfull.

The bus stop for Hop-On Hop-Off Tour was not the one written in the guide and all of them came all the time full. Waited for a bus to Downtown for 1 hour in a 92 degrees hit. That's why, to return, we took the subway.
The guides are talking too fast and sometimes in slang and couldn't understand them. Not all tourists are from USA.
One World Observatory was an excellent experience.
Dorina
Toronto,Canada